21230492 has 12 divisors (see below), whose sum is σ = 37321536. Its totient is φ = 10567200.

The previous prime is 21230483. The next prime is 21230509. The reversal of 21230492 is 29403212.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11009 + ... + 12792.

It is an arithmetic number, because the mean of its divisors is an integer number (3110128).

Almost surely, 2^21230492 is an apocalyptic number.

It is an amenable number.

21230492 is a deficient number, since it is larger than the sum of its proper divisors (16091044).

21230492 is a wasteful number, since it uses less digits than its factorization.

21230492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24028 (or 24026 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 21230492 is about 4607.6558031172. The cubic root of 21230492 is about 276.8981279438.

The spelling of 21230492 in words is "twenty-one million, two hundred thirty thousand, four hundred ninety-two".